shelltest: use a more magical magic number for success.

There may be some odd situation where a shell returns 0 despite not executing
the script correctly; now 0 is an error condition.

redo-sh.do

@@ -40,10 +40,10 @@ for sh in dash sh /usr/xpg4/bin/sh ash posh mksh ksh ksh88 ksh93 pdksh \
 	crash=${crash# }
 	
 	case $RV in
-		0)  echo "ok $msgs"; [ -n "$GOOD" ] || GOOD=$FOUND ;;
+		40)  echo "ok $msgs"; [ -n "$GOOD" ] || GOOD=$FOUND ;;
 		41) echo "failed    $msgs" ;;
 		42) echo "warnings  $msgs"; [ -n "$WARN" ] || WARN=$FOUND ;;
-		*)  echo "crashed   $crash" ;;
+		*)  echo "crash     $crash" ;;
 	esac
 done
 

t/shelltest.do

@@ -2,7 +2,7 @@ set +e
 ( . ./shelltest.od )
 RV=$?
 case $RV in
-	0) exit 0 ;;
+	40) exit 0 ;;
 	42) exit 0 ;;
 	*) exit 1 ;;
 esac

t/shelltest.od

@@ -365,4 +365,5 @@ set x y z
 . ./dotparams.od a b || fail 115
 [ "$1-$2-$3" = "x-y-z" ] || fail 116
 
+[ -n "$FAIL" ] || exit 40
 exit $FAIL